Hi all,
I have a machine with 2 physical CPUs with each 2 cores and
as such when I do cat /proc/cpuinfo on Dom0 it reports 4 CPUs. I want to run a
couple of DomU instances on this machine. However to make sure that Dom0 will
always respond even when the DomU instances have a high load, I want to keep
CPU 0 available only for Dom0. Therefore in the DomU config files I’m
using the following CPU definition: cpus="1-3". Does it makes sense
to do this? Or would Xen handle this better on its own?
Anyway, so one of the DomU instances runs software that I
have bought a 1CPU license for. Consequently I have to set ‘vcpus=1’
otherwise it will tell me that I do not have a multiple CPU license. However it
is ok to have 1 CPU with multiple cores. Therefore to speed it up I was
wondering how I can tell Xen to assign say 2 cores to this DomU instance, but
present it as 1 CPU with 2 cores.
Also how do I see on which physical CPU a DomU instance is
running? When I set cpus=”1-3” and vcpus=”1” , then ‘xm
top’ will show that the instance is running on vCPU 0 (which I assume is CPU
0 of that instance, not physical CPU0 since I deliberately pinned it to CPUs
1-3). Also ‘xm list’ will show how many vCPUs that DomU runs on,
but not on which physical CPU.
Thanks!
Best wishes,
Jonathan Salomon
IT Manager
Panaya Inc. – Cut 50% of
your SAP upgrade cost with automation software.
Tel: +972 (0) 9 761 8007
Cell: +972 (0) 52 7335999
Fax: +972 (0) 9 746 7901
E-mail: jonathan@xxxxxxxxxxxxx
Web: www.panayainc.com
